Post by horsemenlilmike on Jan 26, 2013 12:11:30 GMT -5
have a 79 xs650 took the motor out of the frame to clean up welds that someone did a crappy job on and to paint the frame and tins. so the motor has a pamco ignition already in it all we did was lable each wire to reconnect them back to the right ones. got every thing painted put the motor back in and re conected all the wiring , now it acts like it out of time i wont start and back fires the whole time u try to start it HELP!!!!!!!! IF THERE IS ANYONE AROUND HERE THAT IS CLOSE AND CAN HELP I WOULD APPRECIATE IT.
Post by horsemenlilmike on Jan 28, 2013 11:48:57 GMT -5
the battery is charged had it charged and then just rechecked it to make sure it was and i will double check my grounds but i did remove paint from the areas before putting it back togather im just really floored right now
Well, you have to start narrowing things down and the best place to start is with your basic tuning issues.
adjust the tappets adjust the cam chain be sure you have fuel flowing to the carbs from the petcocks check your voltage at the coil (with the switch on) I'm kinda suspecting the kill switch, but that is just a guess. If your voltage at the coil is low that's where I'd look first static check your timing be sure that both plugs are grounded when you do this (lay them on the fins with the coil-wire caps attached) 'cause the PAMCO unit can be fried if coil current doesn't have someplace to go.
p.s. while you are looking at your grounds don't forget the one that comes off the handlebars (it's lead is bolted to a handlebar perch stem)
Post by tomterrific on Jan 31, 2013 10:24:07 GMT -5
I would concentrate the search in two areas if the engine was running before it came out of the frame.
One is carburetion. Check to make sure the carbs are in the holders. Funny how one can blow out and the other holds it so close a quick inspection might not see the problem. The other is blocked idle jets. Moving the engine may have stired up dirt. Letting the engine sit may have varnish plugging the idle jet. Remove the mixture adjustment screw and blast the idle passage way by sticking the little tube from a can of spray carb cleaner inside. Let it sit a minute and blast again.
Now we are getting to ignition where I think your problem lies. You have reviewed the Pamco install instructions and made sure it is installed correctly? Bypass all the wiring by using jumper wires from the fully charged battery, + to the wire the kill switch goes into the Pamco and the coil. At this point it would be a good idea to jump the - to the engine and coil connection also. You now have direct grounds and wiring and if the plugs are new (I mean really new not just new a month ago) the ignition should work as best it can. You can tell where the flaw is by removing each wire, one at a time, and see if the problem comes back. If a ground wire shows bad then you need to clean up to get a good ground. If the + jumper shows bad you have a fault in the harness or switches on the path to the coil/Pamco. It is probably the kill switch because that is a known problem and my '77 did the backfire thing when the kill switch went bad.
If the motor was running fine when you took it out of the frame and you have not opened up either of the covers at the ends of the camshaft I very much doubt that timing is your issue.
And the PAMCO is pretty forgiving of weak current (my PM /no battery set-up with one is usually a first kick starter).
I'm thinking maybe your switch is the problem. It may be making an erratic connection.
As suggested, a jumper wire will eleminate that possibility as you narrow down "the usual suspects"
Like I said timing is probably not the issue, but it's easy enough to check:
1. take the cover off the ATU (the thing with the bob-weights on the other side of the PAMCO) and determine that the bob-weights have retuned to their resting position. i.e. the springs have pulled them compeletely back.
2. take both plugs out, put them in their caps and rest them on the fins.
3. take off the generator cover (the one on the shift lever side)
4. With a socket/breakerbar turn the bolt in the middle of the roter counter-clockwise while you watch for a spark at the plug gap
5. that spark should occur when the line on the roter is at the "F" on the stator housing.
r80rt: :)This is a splendid write up, THANK YOU!!!!
Dec 26, 2015 16:54:05 GMT -5
mashermoto: What the what is this shoutbox for? Or should I shout, WHAT THE WHAT IS THIS SHOUTBOX FOR!
May 12, 2016 22:22:21 GMT -5
motormike: Good Day ...just a FYI.. Wild Cat is this Labor Day weekend. Still go'n on. A few 650's still make the scene. Various rides at different skill levels each day.. awards dinner sunday eve. BS in the park'n lot after dinner.
Aug 23, 2016 7:57:01 GMT -5
lsettle: First post in over 6 years!
Aug 28, 2016 19:45:17 GMT -5
kardon: Wow quiet here, where did they all go.
Oct 7, 2016 2:18:13 GMT -5
gggGary: XS650.com LOL
Feb 16, 2017 20:49:02 GMT -5
buell88: Anybody have any idea who built the xs650 tracker used in the Draggin Jeans Ad on Pipeburn?
May 16, 2017 16:24:09 GMT -5
joshua: The regulator/rectifier unit I got from Mikes PMA has closer hole spacing than original. Are we supposed to mill the holes to fit?
Jun 7, 2017 19:25:58 GMT -5
joshua: My bad. I found the bracket they supplied to mount the rectifier/regulator... Uh oh. How is this meant to work? Which way is it meant to mount? Looks like I have to use some spacers or something. Good instructions would be nice.
Jun 7, 2017 22:09:52 GMT -5
craig8johnson: Not sure if this is the right spot or not but oh well...
Jul 11, 2017 18:04:15 GMT -5
craig8johnson: I'm checking the charging system. I'm afraid I might have fried the last battery. With the solid state regulator (after market) what should it be charging at. The book says, I think, 15 volts. I'm hitting 17 when revved. Is that too high?
Jul 11, 2017 18:06:19 GMT -5
gggGary: Yes 17 volts is too high, about 14 volts is max, sounds like you don't have the right regulator or it's wired wrong.
Jul 13, 2017 6:54:33 GMT -5
dean: Just saying Hello, new member who is going to fix up a 79 XS650 that has seen its better days. I will definitely have lots of questions coming up.
Jun 23, 2018 16:45:32 GMT -5
tt650: Trying to breathe life into a 1980 that's been stored (indoors) for 25 yrs. Air filters are dry rotted. Have cleaned carbs but she only runs briefly on choke then stops. Need jet setting info and other ideas that might help her idle and rev.
Jul 3, 2018 19:15:19 GMT -5
trix13: Hey everyone! New to the forum and am fighting those gremlins!! New charging system, ignition switch, coil and fuse box. Resistance is higher than normal on the ignition pick up so I'm trying to find one. No such luck yet.
Aug 16, 2018 8:50:48 GMT -5
trix13: Also, even though all of my connections are clean, I cannot seem to find out why , when at higher rpms, I hit the signals and the rpms pulse with the signals...hahah. same with the brake light. I appreciate all input!!
Aug 16, 2018 8:55:08 GMT -5
bob99: how do I post a question. I am new to the forum
Jun 6, 2019 10:52:10 GMT -5
adlpc: Hello all! Been enjoying your edifying posts and discussions - and as a fan of the XS650 since my early teenage years happy that I now own a 1980 Special which I plan to turn into a vintage half faired racer. Thank you all for being here!
Oct 1, 2019 0:58:56 GMT -5
jimothyj: Hello everyone, I just joined & wish would have known about this site in 2014 when I brought my 1974 TX650A back from the grave. I have spent a good deal of $$ and alot of time on it. Just painted it and working on electrical, I will post pics soon,
Apr 10, 2021 2:14:13 GMT -5
louisvan: trix13 - I had a problem with my 1975 SX650. When I got to highway speeds, the engine lost power. The problem was in the connectors. At a certain vibration and the wind pushing on the wiring loom, the connector lost continuity. A bad crimp to the wire.
May 20, 2021 1:19:09 GMT -5